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Table 2 Measurement results for the ideal position of an infra-acetabular screw under different fluoroscopic angles

From: Application of a three-dimensional virtual model to study the effect of fluoroscopic angle on infra-acetabular corridor parameters and screw insertion rates

  IAD (mm) IAL (mm) AIP (°) IR (%)
 Overall 3.89 ± 1.81 80.07 ± 5.79 5.58 ± 5.52 55.61
 Male 4.42 ± 1.80 80.76 ± 5.64 3.40 ± 4.21 68.62
 Female 3.35 ± 1.66 75.87 ± 6.04 9.15 ± 5.57 42.47
 t value 5.96 4.98  − 5.62 χ2 = 25.89
 P value  < 0.001  < 0.001  < 0.001  < 0.001
15°
 Overall 4.08 ± 1.84 85.31 ± 7.25 4.61 ± 5.66 60.42
 Male 4.60 ± 1.82 87.63 ± 7.15 2.16 ± 4.33 73.94
 Female 3.55 ± 1.69 81.94 ± 6.03 8.61 ± 5.30 46.77
 t value 5.82 5.2  − 9.13 χ2 = 28.85
 P value  < 0.001  < 0.001  < 0.001  < 0.001
25°
 Overall 4.08 ± 1.84 92.06 ± 6.95 3.97 ± 5.73 60.42
 Male 4.62 ± 1.84 95.02 ± 6.10 1.79 ± 4.31 73.94
 Female 3.54 ± 1.68 87.47 ± 5.58 7.57 ± 6.00 46.77
 t value 6.06 7.15  − 6.38 χ2 = 28.85
 P value  < 0.001  < 0.001  < 0.001  < 0.001
35°
 Overall 3.99 ± 1.80 95.64 ± 6.70 1.63 ± 5.76 58.56
 Male 4.66 ± 1.82 99.49 ± 5.14  − 0.45 ± 4.56 73.4
 Female 3.32 ± 1.50 89.80 ± 4.02 5.14 ± 5.90 43.55
 t value 7.84 11.91  − 4.4 χ2 = 34.34
 P value  < 0.001  < 0.001  < 0.001  < 0.001
45°
 Overall 3.04 ± 2.18 98.63 ± 7.64  − 0.66 ± 4.87 43.58
 Male 4.03 ± 2.02 101.96 ± 5.99  − 1.95 ± 3.88 64.89
 Female 2.03 ± 1.85 90.10 ± 3.78 3.13 ± 5.54 22.04
 t value 10.27 5.87  − 4.3 χ2 = 69.82
 P value  < 0.001  < 0.001  < 0.001  < 0.001
  1. IAD, diameter of IAC; IAL, length of IAC; AIP, angle between the IAC axis and the sagittal midline plane; if IAC directed to lateral, a value of AIP was positive. IR, insertion rate; χ2, chi-squared